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DATA
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PDOC00646
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1995-07-26
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* Glucoamylase active site region signature *
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Glucoamylase (GA) (EC 3.2.1.3) is an enzyme that catalyzes the release of D-
glucose from the non-reducing ends of starch and other oligo- or
polysaccharides. Extensive studies of fungal GA have shown [1] that three
closely clustered acidic residues play a role in the catalytic mechanism of
GA. The region that includes these residues is also conserved in a recently
sequenced bacterial GA [2]. We used this region as a signature pattern.
-Consensus pattern: [STN]-G-x(1,2)-[DE]-x-W-E-E-x(2)-G
[All D/E are active site residues]
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Note: these proteins belong to family 15 in the classification of glycosyl
hydrolases [3].
-Note: a GA from Schwanniomyces occidentalis is not a member of this family
but belongs to family 31 (see the relevant entry).
-Last update: October 1993 / First entry.
[ 1] Sierks M.R., Ford C., Reilly P.J., Svensson B.
Protein Eng. 3:193-198(1990) .
[ 2] Ohnishi H., Kitamura H., Minowa T., Sakai H., Ohta T.
Eur. J. Biochem. 207:413-418(1992).
[ 3] Henrissat B.
Biochem. J. 280:309-316(1991).